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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625a9937d661391d141dc98e6fcea252abd9d660f5a25ca076c0999f143337ab' 
  AND token = '/L8SM8rhjv8aIFio3FsAVbq/huVLF1rHEMsrA6FJ7I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}